Statistics for occurrence #1 of “Williamsport” in year 1861, month June, day 17 of Rebellion Record: a Diary of American Events, Diary from December 17, 1860 - April 30, 1864:
... equipage — Sibley and Wall tents, army wagons, &c. The uniform is the standard gray, furnished by the State--the muskets the Springfield rifle.
General Patterson crossed the Potomac at Williamsport , and marched down the Virginia banks of the Potomac towards Harper's Ferry.--National Intelligencer, June 18.
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